Alert archive / Minnesota / Flash Flood Warnings in 1990

Flash Flood Warning 21, NWS Twin Cities, MN

July 28, 1990Olmsted County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Jul 28, 1990, 1:59 AM CDT for Olmsted County, Minnesota. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jul 28, 1990, 1:59 AM CDT (06:59 UTC)
Expired: Jul 28, 1990, 4:00 AM CDT
In force: 2 hr
Issued by: NWS Twin Cities, MN
Area: Whole counties

County Olmsted County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 7.0 hours before the alert went out and 134 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 954 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KRST 280657
FFWRST
MNC109-045-169-055-280900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
FLASH FLOOD WARNING 
NATIONAL WEATHER SERVICE ROCHESTER MN
157 AM CDT SAT JUL 28 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING 
EFFECTIVE UNTIL 400 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE SOUTHEAST PART OF MINNESOTA
      EASTERN OLMSTED...NORTHERN FILLMORE...WINONA...NORTHERN 
      HOUSTON

THIS WARNING INCLUDES THE TOWNS OF EYOTA...ST. CHARLES...LANESBORO..
RUSHFORD...HOUSTON...AND WINONA MINNESOTA.  THIS WARNING ALSO
INCLUDES WHITEWATER STATE PARK.  THE WARNING DOES NOT INCLUDE
ROCHESTER.
AT 145 AM CDT THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED IN
EXTREME SOUTHEAST MINNESOTA BETWEEN ROCHESTER AND LACROSSE WISCONSIN
THE STORMS WERE MOVING SLOWLY EAST AT 20 MPH.
SOME WATER WAS REPORTED OVER THE ROADS IN THE PETERSON/RUSHFORD
AREA OF EXTREME SOUTHEAST MINNESOTA.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER
TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH
FLOODING IS OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD
WATERS.  DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER
BEGINS RISING.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.
DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER
COVERS THE ROADWAY.

  A FLASH FLOOD WATCH REMAINS IN EFFECT FOR PARTS OF SOUTHERN
  MINNESOTA UNTIL 6 AM CDT SATURDAY.  STAY TUNED FOR LATER
  STATEMENTS AND POSSIBLE WARNINGS.

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 7:27 PM CDT	Flash Flood Warning	MPX	Blue Earth, Brown, Nicollet	2 hr
Jul 27, 9:17 PM CDT	Flash Flood Warning	MPX	McLeod, Renville, Sibley	73 min
Jul 27, 9:28 PM CDT	Flash Flood Warning	MPX	Blue Earth, Brown, Nicollet	2 hr
Jul 28, 1:59 AM CDT	Flash Flood Warning	MPX	Fillmore, Houston, Winona	2 hr
Jul 28, 6:19 PM CDT	Severe Thunderstorm Warning	MPX	Brown	41 min
Jul 28, 6:43 PM CDT	Flash Flood Warning	MPX	Dakota, Ramsey, Washington	42 min
Jul 28, 6:53 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Nicollet	37 min

Nearby

Flash Flood Warnings in Minnesota, 1990 Every flash flood warning in 1990

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.